Cook the pasta in boiling salted water until just al dente, add the baby spinach approx. 1 min. before the cooking time is up. Drain the pasta and spinach, transfer to a bowl.
Heat the oil in a frying pan, stir fry the aubergine for approx. 4 mins., season, add to the pasta, mix.
Mix in the oil and feta, season, serve the salad warm.